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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeb8ad28335d9d46a12887b4201d5db87cf82f51f1ad4e6f00fd1b44e68ea59' 
  AND token = 'eApj26AGdSSlFmKQA/BC8Fw0izmWoWt/vt1NAzmD0+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}